Dev Mode, gJED, Mas tool comes with the rF2 steam install. You can install your steam games on a few PC's/laptop To sync your dev mode folder with another PC/laptop/user: use onedrive, dropbox, ...
All these years I really havent thought that I can have the same games in another computer with steam, I've always assumed that one machine one install.
Just install steam in your laptop or other PC and login to your account. And install the games you purchased. Some games use the "steam cloud" to save game prgress. So you can game on your main PC and continue on holiday on your laptop. At some steam cyber cafes you login to your account and continue your game. Also check out "steam remote" if you have a less powerfull laptop and you want to check your mod in dev mode at full settings on your main PC, while you are sitting on the cough next to the Misses. Wifey will be happy...